/* * soc-io.c -- ASoC register I/O helpers * * Copyright 2009-2011 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/i2c.h> #include <linux/spi/spi.h> #include <linux/regmap.h> #include <linux/export.h> #include <sound/soc.h> /** * snd_soc_component_read() - Read register value * @component: Component to read from * @reg: Register to read * @val: Pointer to where the read value is stored * * Return: 0 on success, a negative error code otherwise. */ int snd_soc_component_read(struct snd_soc_component *component, unsigned int reg, unsigned int *val) { int ret; if (component->regmap) ret = regmap_read(component->regmap, reg, val); else if (component->read) ret = component->read(component, reg, val); else ret = -EIO; return ret; } EXPORT_SYMBOL_GPL(snd_soc_component_read); /** * snd_soc_component_write() - Write register value * @component: Component to write to * @reg: Register to write * @val: Value to write to the register * * Return: 0 on success, a negative error code otherwise. */ int snd_soc_component_write(struct snd_soc_component *component, unsigned int reg, unsigned int val) { if (component->regmap) return regmap_write(component->regmap, reg, val); else if (component->write) return component->write(component, reg, val); else return -EIO; } EXPORT_SYMBOL_GPL(snd_soc_component_write); static int snd_soc_component_update_bits_legacy( struct snd_soc_component *component, unsigned int reg, unsigned int mask, unsigned int val, bool *change) { unsigned int old, new; int ret; if (!component->read || !component->write) return -EIO; mutex_lock(&component->io_mutex); ret = component->read(component, reg, &old); if (ret < 0) goto out_unlock; new = (old & ~mask) | (val & mask); *change = old != new; if (*change) ret = component->write(component, reg, new); out_unlock: mutex_unlock(&component->io_mutex); return ret; } /** * snd_soc_component_update_bits() - Perform read/modify/write cycle * @component: Component to update * @reg: Register to update * @mask: Mask that specifies which bits to update * @val: New value for the bits specified by mask * * Return: 1 if the operation was successful and the value of the register * changed, 0 if the operation was successful, but the value did not change. * Returns a negative error code otherwise. */ int snd_soc_component_update_bits(struct snd_soc_component *component, unsigned int reg, unsigned int mask, unsigned int val) { bool change; int ret; if (component->regmap) ret = regmap_update_bits_check(component->regmap, reg, mask, val, &change); else ret = snd_soc_component_update_bits_legacy(component, reg, mask, val, &change); if (ret < 0) return ret; return change; } EXPORT_SYMBOL_GPL(snd_soc_component_update_bits); /** * snd_soc_component_update_bits_async() - Perform asynchronous * read/modify/write cycle * @component: Component to update * @reg: Register to update * @mask: Mask that specifies which bits to update * @val: New value for the bits specified by mask * * This function is similar to snd_soc_component_update_bits(), but the update * operation is scheduled asynchronously. This means it may not be completed * when the function returns. To make sure that all scheduled updates have been * completed snd_soc_component_async_complete() must be called. * * Return: 1 if the operation was successful and the value of the register * changed, 0 if the operation was successful, but the value did not change. * Returns a negative error code otherwise. */ int snd_soc_component_update_bits_async(struct snd_soc_component *component, unsigned int reg, unsigned int mask, unsigned int val) { bool change; int ret; if (component->regmap) ret = regmap_update_bits_check_async(component->regmap, reg, mask, val, &change); else ret = snd_soc_component_update_bits_legacy(component, reg, mask, val, &change); if (ret < 0) return ret; return change; } EXPORT_SYMBOL_GPL(snd_soc_component_update_bits_async); /** * snd_soc_component_async_complete() - Ensure asynchronous I/O has completed * @component: Component for which to wait * * This function blocks until all asynchronous I/O which has previously been * scheduled using snd_soc_component_update_bits_async() has completed. */ void snd_soc_component_async_complete(struct snd_soc_component *component) { if (component->regmap) regmap_async_complete(component->regmap); } EXPORT_SYMBOL_GPL(snd_soc_component_async_complete); /** * snd_soc_component_test_bits - Test register for change * @component: component * @reg: Register to test * @mask: Mask that specifies which bits to test * @value: Value to test against * * Tests a register with a new value and checks if the new value is * different from the old value. * * Return: 1 for change, otherwise 0. */ int snd_soc_component_test_bits(struct snd_soc_component *component, unsigned int reg, unsigned int mask, unsigned int value) { unsigned int old, new; int ret; ret = snd_soc_component_read(component, reg, &old); if (ret < 0) return ret; new = (old & ~mask) | value; return old != new; } EXPORT_SYMBOL_GPL(snd_soc_component_test_bits); unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg) { unsigned int val; int ret; ret = snd_soc_component_read(&codec->component, reg, &val); if (ret < 0) return -1; return val; } EXPORT_SYMBOL_GPL(snd_soc_read); int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg, unsigned int val) { return snd_soc_component_write(&codec->component, reg, val); } EXPORT_SYMBOL_GPL(snd_soc_write); /** * snd_soc_update_bits - update codec register bits * @codec: audio codec * @reg: codec register * @mask: register mask * @value: new value * * Writes new register value. * * Returns 1 for change, 0 for no change, or negative error code. */ int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned int reg, unsigned int mask, unsigned int value) { return snd_soc_component_update_bits(&codec->component, reg, mask, value); } EXPORT_SYMBOL_GPL(snd_soc_update_bits); /** * snd_soc_test_bits - test register for change * @codec: audio codec * @reg: codec register * @mask: register mask * @value: new value * * Tests a register with a new value and checks if the new value is * different from the old value. * * Returns 1 for change else 0. */ int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned int reg, unsigned int mask, unsigned int value) { return snd_soc_component_test_bits(&codec->component, reg, mask, value); } EXPORT_SYMBOL_GPL(snd_soc_test_bits); int snd_soc_platform_read(struct snd_soc_platform *platform, unsigned int reg) { unsigned int val; int ret; ret = snd_soc_component_read(&platform->component, reg, &val); if (ret < 0) return -1; return val; } EXPORT_SYMBOL_GPL(snd_soc_platform_read); int snd_soc_platform_write(struct snd_soc_platform *platform, unsigned int reg, unsigned int val) { return snd_soc_component_write(&platform->component, reg, val); } EXPORT_SYMBOL_GPL(snd_soc_platform_write);